They hand out the tickets in front of the skating rink at times published in the daily Cruise Compass - this is usually done on the morning of the second day but you need to be on the look out for the announcement. It is first come, first served, so if you want to ensure you get your preferred time your only option is to show up as soon as they start handing out the tickets. You can send one person for your whole party to get tickets. No need for everyone to be there.
It is the same show for every performance.